sacroiliitis

Sacroiliitis is a condition caused by inflammation within the sacroiliac (SI) joint, where the base of the spine (called the sacrum), and the pelvis (called the ilium), connect. The term "sacroiliitis" combines the words sacrum, ilium, and the Latin term "itis", which denotes inflammation.

Key facts

Medical condition (new).name: Sacroiliitis
Medical condition (new).image: Sacroiliitis MRI ar1934-5.gif
Medical condition (new).caption: Magnetic resonance images of sacroiliac joints. Shown are T1-weighted semi-coronal magnetic resonance images through the sacroiliac joints (a) before and (b) after intravenous contrast injection. Enhancement is seen at the right sacroiliac joint (arrow, left side of image), indicating active sacroiliitis. This patient had psoriatic arthritis.
Medical condition (new).diagnosis: X-ray, MRI

via Wikipedia infobox

Research

3,094 papers

Sacroiliitis in inflammatory bowel disease.Current opinion in rheumatology · 2024
When it is not sacroiliitis.Skeletal radiology · 2025
Acute sacroiliitis.Clinical rheumatology · 2016
Defining active sacroiliitis on MRI for classification of axial spondyloarthritis: update by the ASAS MRI working group.

~6 min read

Article

10 sections

Contents

Symptoms and signs
Cause
Diagnosis
Treatment
Non-surgical
Surgical
Experimental
See also
References
External links

Inflammation in the SI joint can develop through several different processes. It is a feature of spondyloarthropathies, such as axial spondyloarthritis (including ankylosing spondylitis), psoriatic arthritis, reactive arthritis or arthritis related to inflammatory bowel diseases, including ulcerative colitis or Crohn's disease. It is also the most common presentation of arthritis from brucellosis. Problems with the SI joint are in some cases caused by injury in childbirth, other injury, a congenital condition, or a viral or bacterial infection.